Refactor ruthlessly. Rewrite bravely.

(Nearly all of the code from D3 3.x has been rewritten.)

If I can find some time, maybe I can help pitch in somehow.

That should work, but it's a non-trivial change.

Right now major changes require a deep and broad understanding of the codebase and how things get done.

If we renamed things more often, then it probably wouldn’t be so hard to name them in the first place.

Got a bit sidetracked into refactoring the Element visitor code, so haven't actually started on the event handler stuff per se, but that'll come soon. Element stuff is starting to feel a bit more logical and easier to follow.